

table.treetable span.indenter a {
  background-position: left center;
  background-repeat: no-repeat;
  display: inline-block;
  text-decoration: none;
  width: 19px;
}
table.treetable tr.collapsed span.indenter a {
background-image: url(../images/treetable/expand.png);
}

table.treetable tr.expanded span.indenter a {
background-image: url(../images/treetable/collapse.png);
}